This chapter highlights use of meta-analysis and meta-analytic structural equation modeling (MASEM) to examine the connection between psychological capital (PsyCap) and organizational citizenship behavior (OCB). In order to provide a solid evaluation of the relationship between these constructs, the analysis synthesizes findings from 22 studies that were published between 2015 and 2024. Strict inclusion criteria, which prioritized representative sample sizes, the reporting of inter-construct correlations with corresponding p values, and the use of latent variable approaches for both PsyCap and OCB, were used to select the studies. Using a random-effects model and the Fisher r-to-z transformation, the analysis showed a statistically significant positive correlation between PsyCap and OCB. Robustness against potential bias is suggested by publication bias assessment, which includes the Egger, Begg, and Fail-Safe N tests. With an estimated coefficient of 0.5045 (p < 0.001), MASEM, which is carried out using the LAVAAN code, validated the significant path from PsyCap to OCB. These results, which show consistent effects across different research contexts, lend credence to the idea that higher psychological capital is associated with more organizational citizenship behavior.